Click the hammer in the shop to equip it.
M to toggle menu, screen, and shop.
Kill zombies for balloons.
you have to hit the locks with your hammer to buy and purchase hammers. hover over hammers in the shop to see descriptions and abilities. also, only the default and the explosive are working, so at least you can see the models and stuff. Balloons are increased by 100x in this test build for competition and will be removed after the full game is released.